Metal Derivatives of Thiosemicarbazones: Crystal and Molecular Structures of Mono‐ and Dinuclear Copper(II) Complexes with N1‐Subsitituted Salicylaldehyde Thiosemicarbazones |
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Authors: | Prof Dr Tarlok S Lobana Poonam Kumari Ray J Butcher Jerry P Jasinski James A Golen |
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Institution: | 1. Department of Chemistry, Guru Nanak Dev University, Amritsar‐143 005, India;2. Department of Chemistry, Howard University, Washington DC 20059, USA;3. Department of Chemistry, Keene State College, 229 Main Street, Keene, NH 03435–2001, USA |
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Abstract: | Reactions of copper(II) acetate with N1‐subsitituted salicylaldehyde thiosemicarbazones R1R2C2=N3–N2H–C1(=S)–N1HR3;R1 = 2‐HO–C6H4–, R2 = H : R3 = Me (H2L1), Et (H2L2)] are described. Copper(II) acetate was reacted with H2L1 and H2L2 ligands in the presence of polypyridyl co‐ligands, and this led to the formation ofmononuclear complexes, Cu(κ3‐O, N, S‐L1)(κ2‐N, N‐bipy)] ( 1 ),Cu(κ3‐O, N, S‐L)(κ2‐N, N‐phen)] L = L1 ( 3 ), L2 ( 4 )], Cu(κ3‐O, N, S‐L)(κ2‐N, N‐tmphen)] L =L1 ( 5 ), L2 ( 6 )] and a dinuclear complex, Cu2L22(bipy)] ( 2 ) (bipy = 2, 2′‐bipyridine, phen = 1, 10‐phenanthroline, tmphen = 3, 4, 7, 8‐tetramethyl‐1, 10‐phenanthroline). In dinuclear complex 2 , one ligand is O, N3,S‐chelating, while second is O, N3,S‐chelation‐cum‐N2‐bridging; and in all others thio‐ligands are O, N3,S‐chelating. The μeff values for the complexes lie in the range of 1.79–1.83 BM. Complexes 1 , 3 – 6 have square pyramidal arrangement, whereas complex 2 has two independent molecules in the crystal lattice, and each molecule has trigonal bipyramidal square planar (5:4) coordination pair. Complexes 2 , 4 , and 6 showed fluorescence properties. |
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Keywords: | Thiosemicarbazone Copper Bipyridine Phenanthroline |
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